Note that clicking on the URIs of the named graphs will not necessarily lead you anywhere. They are just used inside the triplestore as names for graphs, and might not resolve via HTTP.

Please try to keep the server load of your queries low. This can easily be accomplished by 1) restricting you queries to the named graphs you need, instead of querying the entire triplestore or a multitude of graphs, 2) uinge the LIMIT clause in your queries.

DBpedia

A subset of DBpedia is contained within the HCLS Knowledge Base. This subset contains the english labels and short abstracts of all DBpedia entries, as well as the YAGO hierarchy. The rationale for including a subset of DBpedia is that it provides a huge taxonomy of entities that are relevant for the HCLS domain (among many other things).